Pepper spray was used to break up a fight after a man's sentencing for the murder of Davarus Neelon in February 2013.

Derick Neelon, 29, Davarus Neelon's brother, was involved the fight and was charged with assault and obstructing an officer.

Two and a half years later, Derick Neelon's wanted on another charge -- violating the rules of the sex offender registry.

He was convicted in 1999 of assault with intent to commit sexual abuse in Woodbury, Iowa, when he was 13 years old. Derick Neelon moved to Nebraska and is on the sex offender registry for life, meaning he has to check in with the sheriff every three months.

According to the warrant, he hasn't done that since this time last year. Derick Neelon is 5 feet 11 inches tall, weighs about 175 pounds and may be wearing glasses. His last known address was near 20th and Pinkney.

The Omaha Police Department and Crime Stoppers are asking for the community's help in finding him.

All tips go through a process where the person supplying the information is given a code word and number, so he or she can't be identified.

If a suspect/suspects are caught and charged, the tipster could be eligible for a cash reward. You can tip by calling 402-444-STOP, by texting 'OPD' and the message to 274637 or you can tip online: http://omahacrimestoppers.org/.